Asked by alice
                For a positive integer n, the rational number r satisfies
2n/n + 2n/(n + 1) = r*2n/n - n/(n - 1)
Express r in terms of n. (Your expression should be as simplified as possible.)
            
            
        2n/n + 2n/(n + 1) = r*2n/n - n/(n - 1)
Express r in terms of n. (Your expression should be as simplified as possible.)
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